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Hello Macy,

LTspice accepts .model with and without brackets.

.model 2N22222 NPN (Is=1e-16 BF=100)

.model 2N22222 NPN Is=1e-16 BF=100

I recommend to use brackets, because it's more common and it
will then work with every SPICE program.

Best regards,
Helmut

found this old thing ...similar, somebody may want it.

.model PN4250 PNP(Is=6.734f Xti=3 Eg=1.11 Vaf=45.7 Bf=388.2 Ne=1.806
+ Ise=6.734f Ikf=.205 Xtb=1.5 Br=2.635 Nc=2 Isc=0 Ikr=0 Rc=1.67
+ Cjc=6.2p Mjc=.301 Vjc=.75 Fc=.5 Cje=7.5p Mje=.2861 Vje=.75
+ Tr=9.861n Tf=467.9p Itf=.17 Vtf=5 Xtf=8 Rb=10)
* National pid=62 case=TO92
* 88-09-08 bam creation


hmmm...don't need the parentheses anymore eh?



--- jean_claudeabeille@... wrote:

From: "jean_claudeabeille" <jean_claudeabeille@...>
To: LTspice@...
Subject: [LTspice] Re: MPS4250
Date: Sun, 21 Jul 2013 00:01:32 -0000

Thank you for your answer, it's very kind

Thank you for your answer, it's very kind

The grandfather of all spice programs was a phd thesis in one of the California universities.
it was even called spice which indicated a ( S? Program for Integrated Circuit Engineering.)
it's primary purpose was mos circuits as I recall. It was mid to late 60's I think.

--- In LTspice@..., abeill?? jean-claude <jean_claudeabeille@...> wrote:

Thank you for the tutorial, I wouldn't have found out in what
folder - temp - to store the file.
OK, it's done, file name is AmpJCA.asc.

Hello Jean,

The circuit had a lot of mistakes. I tried to correct them.
Please watch all the circles and my other comments in the
schematic. My files:

Files > Temp > AmpJCA_1.zip

I have used most of the missing transistor models from
bordodynov's file standard.zip.


Over all we don't want discuss the design of audio amplifiers
in the LTspice Yahoo group. You should do that in DiY-Audio
groups. There are also books about audio amplifiers, e.g.
this one from Cordell, .

Best regards,
Helmut

In message <kseg1d+mptm@...>, dated Sat, 20 Jul 2013, legg@... writes:

Mind you, there are spice era files from (likely) elsewhere that predate these - mostly libraries. The same file type from a Basso Pspice CD install is marked Nov98.

It's normally completely impossible to know when anything really started. I know that an ex-colleague was doing simulations at Kings College, London of audio circuits using FORTRAN with matrices no later than early 1964 (because that's when the lab caught fire).
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

--- In LTspice@..., "Helmut" <helmutsennewald@...> wrote:

--- In LTspice@..., "analogspiceman" <analogspiceman@> wrote:

--- In LTspice@..., Helmut <helmutsennewald@> wrote:
(snip)
"LTspice was released in Oct 1999 at a meeting of Linear
Technology's Field Application Engineers. They were then free
to give it to customers they met on a visit-by-visit basis."

Hello analogspiceman,

Now I know why I have seen LTspice only later in 2001. Maybe
our FAE overlooked my interest in LTspice. :-)

Best regards,
Helmut

The old W98 installation on this machine has files in the SWCAD directory, probably copied from an installation CD, that have 'modified' time stamps of Oct'99. This is likely when the CD contents originated.

That would have been probably the only time a CD install was performed - updates being from the web. The V1.001 web installer is in a folder dated Oct 2002.

Mind you, there are spice era files from (likely) elsewhere that predate these - mostly libraries. The same file type from a Basso Pspice CD install is marked Nov98.

RL

There is an extra square dot on the base of Q13, which looks odd. It
implies there is an extra wire junction there. I think this is harmless
(the Netlist looks OK). I mention it because it is part of the biasing
circuit where you were having trouble.

Andy

OK, it's done, file name is AmpJCA.asc.

It is missing the symbol for "LF353". That is the error message I get when
trying to load your file into LTspice.

If your schematic uses any new symbols or models or subcircuits that didn't
come with LTspice itself (such as the LF353), then you will need to upload
those along with your schematic file, also to the group's "Temp" folder.
The recommendation is that you ZIP all the files, with your schematic file
(except for .log and .raw files), into one .zip file, and then upload just
the .zip file to the Temp folder.

I also just noticed: You have a 2N5401C shown as both a PNP and an NPN.

I see you also have many unique transistor part numbers, which are not in
LTspice's transistor library. Will you also have SPICE models for them?
Currently they will not simulate as the part numbers you've given.

Regards,
Andy

In message <1374329454.5183.YahooMailNeo@...>,
dated Sat, 20 Jul 2013, abeillé jean-claude
<jean_claudeabeille@...> writes:

Thank you for the tutorial, I wouldn't have found out in what folder -
temp - to store the file. OK, it's done, file name is AmpJCA.asc.

It is missing the symbol LF353. It is always good to try to run the
actual file you intend to upload. Please do that and then upload the
LF353 symbol and anything else that proves to be missing.

Q14 base doesn't go anywhere. Is that correct?
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

Thank you for the tutorial, I wouldn't have found out in what folder - temp - to store the file.
OK, it's done, file name is AmpJCA.asc.




________________________________
De?: John Woodgate <jmw@...>
??: LTspice@...
Envoyé le : Samedi 20 juillet 2013 11h10
Objet?: Re: [LTspice] Re: MPS4250



?
In message <ksdh55+evd7@...>, dated Sat, 20 Jul 2013,
jean_claudeabeille <jean_claudeabeille@...> writes:

OK, I would like it.
I sent this text from yahoo mail and never received the answer.
Fortunately I found it here. Problem is : I don't know how to join a
schematic here while it's easy with yahoo mail. How can I proceed ?

Look at these links at the foot of each list message:

To upload a schematic, go to the web site and click on 'Files' in the
left column. On the Files page, scroll down to 'Temp' in the middle
column and click on it. On the Temp page, click on 'Add file' at the top
right of the middle column. Use, for example 'MPS4250 model.asc' as the
filename.

Disregard the part headed 'Auto-send to members' (if it appears) and
tick the box under 'Notification'. Then click on the blue 'Upload' box.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK



[Non-text portions of this message have been removed]

In message <kse0bg+gakv@...>, dated Sat, 20 Jul 2013, Helmut <helmutsennewald@...> writes:

One would have to make a transformer based ob B-sources plus inductors.

Google: ideal transformer spice

Thank you. I thought that the OP had limited his options too much. He can do it using the method you indicate.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

--- In LTspice@..., John Woodgate <jmw@...> wrote:

In message <ksdlam+2tic@...>, dated Sat, 20 Jul 2013, Helmut
<helmutsennewald@...> writes:

The answer is no.
Everything defined with .param will be evaluated at the beginning of a
simulation and is then constant for the whole simulation.

But is there another way to change K at a specified time during a .tran
simulation?
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

Hello John,

One would have to make a transformer based ob B-sources plus
inductors.

Google: ideal transformer spice

Best regards,
Helmut

Hello,Helmut,
?
Thank you so much.
my problem has soleved!
?
Shukichi


________________________________
From: Helmut <helmutsennewald@...>
To: LTspice@...
Sent: Saturday, July 20, 2013 6:26 PM
Subject: [LTspice] Re: Measure statements description to find cut off frequency


?



--- In mailto:LTspice%40yahoogroups.com, "shukichi2079" <shukichi2079@...> wrote:

Hello.
Regarding to AC simulation.
I want to know cut off frequency
using ".measure" statements.
In LT spice help, I found how
to describe band-width but
I don't know how to describe
to find cut off frequency only.

if you know description it,
please teach me.

Regards.
Shukichi

Hello Shukichi,

Please take a look the examples from our Files-section.

Files > Tut > MEASURE > AC



Best regards,
Helmut




[Non-text portions of this message have been removed]

In message <ksdlam+2tic@...>, dated Sat, 20 Jul 2013, Helmut <helmutsennewald@...> writes:

The answer is no.
Everything defined with .param will be evaluated at the beginning of a simulation and is then constant for the whole simulation.

But is there another way to change K at a specified time during a .tran simulation?
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

In message <MfjOdgDTQl6RFw$6@...>, dated Sat, 20 Jul 2013, John Woodgate <jmw@...> writes:

In message <ksdh55+evd7@...>, dated Sat, 20 Jul 2013, jean_claudeabeille <jean_claudeabeille@...> writes:

OK, I would like it.
I sent this text from yahoo mail and never received the answer. Fortunately I found it here. Problem is : I don't know how to join a schematic here while it's easy with yahoo mail. How can I proceed ?

Look at these links at the foot of each list message:

They were stripped out by the server. The important one is:



which takes you to the list's site front page.

To upload a schematic, go to the web site and click on 'Files' in the left column. On the Files page, scroll down to 'Temp' in the middle column and click on it. On the Temp page, click on 'Add file' at the top right of the middle column. Use, for example 'MPS4250 model.asc' as the filename.

Disregard the part headed 'Auto-send to members' (if it appears) and tick the box under 'Notification'. Then click on the blue 'Upload' box.

--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

--- In LTspice@..., "bryan.esteban@..." <bryan.esteban@...> wrote:

Greetings,

I'm interested in applying a step change to the coupling coefficient of two coupled inductors during transient analysis at a desired time. Is this something that can be done using the .func & .param commands?

Thanks in advance for any assistance rendered.

Bryan

Hello Bryan,

The answer is no.
Everything defined with .param will be evaluated at the beginning
of a simulation and is then constant for the whole simulation.

Best regards,
Helmut

--- In LTspice@..., "shukichi2079" <shukichi2079@...> wrote:

Hello.
Regarding to AC simulation.
I want to know cut off frequency
using ".measure" statements.
In LT spice help, I found how
to describe band-width but
I don't know how to describe
to find cut off frequency only.

if you know description it,
please teach me.

Regards.
Shukichi

Hello Shukichi,

Please take a look the examples from our Files-section.

Files > Tut > MEASURE > AC



Best regards,
Helmut

Hello.
Regarding to AC simulation.
I want to know cut off frequency
using ".measure" statements.
In LT spice help, I found how
to describe band-width but
I don't know how to describe
to find cut off frequency only.

if you know description it,
please teach me.

Regards.
Shukichi

In message <ksdh55+evd7@...>, dated Sat, 20 Jul 2013, jean_claudeabeille <jean_claudeabeille@...> writes:

OK, I would like it.
I sent this text from yahoo mail and never received the answer. Fortunately I found it here. Problem is : I don't know how to join a schematic here while it's easy with yahoo mail. How can I proceed ?

Look at these links at the foot of each list message:



To upload a schematic, go to the web site and click on 'Files' in the left column. On the Files page, scroll down to 'Temp' in the middle column and click on it. On the Temp page, click on 'Add file' at the top right of the middle column. Use, for example 'MPS4250 model.asc' as the filename.

Disregard the part headed 'Auto-send to members' (if it appears) and tick the box under 'Notification'. Then click on the blue 'Upload' box.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK